Keita, longtime servant and childhood friend to Himeko, finds their familiar evening routine disrupted when she reveals a fiancé and asks for his honest reaction on the eve of her birthday. The exchange brings to light a forgotten promise from their past, leaving him determined to make amends in a way that honors their bond. At the same time, Yamato’s recent confession to Nadeshiko has launched their first romance, though he remains uneasy about his own intense feelings. After she invites him to stay the night following a study session, her gentle reassurance hints that she may welcome a closeness he never expected.